where in barnstable ma can i buy a fan for the back of my xbox 360?

Answer 1

According to a Microsoft employee (a Google machine-translated version of his report is linked below) says, that the airflow of the 360 cannot be improved by putting fans on the outside.
If you use not authorized equipment with the Xbox it will void your warranty.

There have already be reports of a product damaging the Xbox.

I would advise to keep away from external cooling solutions.

If yor Xbox has heat problems, try to find a better place to put your 360. Or call Microsoft toll free, if you suspect your Xbox is broken.